EP0684617B1 - Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence - Google Patents

Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence Download PDF

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Publication number
EP0684617B1
EP0684617B1 EP95113100A EP95113100A EP0684617B1 EP 0684617 B1 EP0684617 B1 EP 0684617B1 EP 95113100 A EP95113100 A EP 95113100A EP 95113100 A EP95113100 A EP 95113100A EP 0684617 B1 EP0684617 B1 EP 0684617B1
Authority
EP
European Patent Office
Prior art keywords
conductor
wire
winding
insulating
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95113100A
Other languages
German (de)
English (en)
Other versions
EP0684617A2 (fr
EP0684617A3 (fr
Inventor
Tadashi Yamaguchi
Masataka Muramatsu
Naoki Katagiri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Totoku Electric Co Ltd
Original Assignee
Totoku Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Totoku Electric Co Ltd filed Critical Totoku Electric Co Ltd
Priority to DE1992627599 priority Critical patent/DE69227599T2/de
Priority claimed from EP92307575A external-priority patent/EP0583521B2/fr
Publication of EP0684617A2 publication Critical patent/EP0684617A2/fr
Publication of EP0684617A3 publication Critical patent/EP0684617A3/fr
Application granted granted Critical
Publication of EP0684617B1 publication Critical patent/EP0684617B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers

Definitions

  • This device relates to an insulated wire for a winding suited to be used in a high frequency transformer, a high frequency reactor, or a high frequency coil used in such devices such as a switching power source.
  • a magnet wire manufactured by forming an insulating layer made of such a material as polyurethane resin or polyester resin on a single wire conductor has been used as an insulated wire for a winding for a switching power source.
  • a safety transformer for such a device as a switching power source must follow the following restrictions based on IEC International Electrotechnical Commission) or UL (Standards of Underwriter's Laboratories, Inc.,) as well as on other various types of safety standard;
  • this invention proposed use of a 3-layered insulated wire for a winding to be used in a transformer, as described in Japanese Utility Model Application No. 49802/1990, Japanese Patent Application laid-open No.4042515/1992, Japanese Utility Model Application No. 49801/1990, and EP-A-0 258 036 which describes a multi-layered insulated wire according to the preamble of claim 1, and now it is possible to satisfy the safety standards such as IEC or UL.
  • a high frequency in a range from several tens KHz to several hundreds KHz is now used for a switching frequency to improve the switching efficiency.
  • This invention was made to solve the problems as described above, and the object is to provide an insulated electric wire for a winding to be used in a transformer, which satisfies the various types of requirements for safety as described above and can contribute to reduction of heat emission from a transformer even if the switching frequency is in a high frequency band area.
  • this invention provides a multi-layered insulated wire for a winding to be used in a high frequency transformer comprising:
  • the aforesaid bundled insulated conductor according to this invention may be manufactured by bundling a plurality of the aforesaid insulated element wires almost in parallel to each other into a conductor having a round cross section, or by bundling a plurality of the aforesaid insulated element wires by twisting said element wires by means of bundle-twisting, co-axial twisting, or litz twisting.
  • a small diameter wire such as a copper wire, a copper-alloy wire, or a tin- or solder-plated copper wire is used as a conductor for the element wire.
  • a size of this small diameter conductor is in a range from 0. 08 mm (AWG 40) to 0.20 mm (AEG 32).
  • a layer manufactured by winding a heat-resistant plastic film such as, for instance, a polyimide film, an aromatic polyamide film, a polyether ether ketone film, a polyphenylene sulfide (PPS) film, or a polyester film in an overlapped relation is used.
  • a heat-sensing adhesive layer may be arranged on the aforesaid heat-resistant plastic film, and after said film is wound around a conductor, heat may be applied to integrate the heat-sensing adhesive layer with the heat-resistant film.
  • films having different colors may be used for each layer respectively, or each layer may be colored differently by employing such a method as adding a specific dyestuff to a heat-sensing adhesive layer for a film with a heat-sensing adhesive layer to color each layer differently, to clearly identify each insulating layer.
  • an extruded layer made of a heat-resistant resin an extruded layer manufactured by extruding a heat-resistant resin such as various types of fluorine resin or various types of engineering plastics several times over a conductor is available.
  • each layer may be colored differently by, for instance, using a resin having a different color for each insulating layer respectively, to clearly identify each insulating layer.
  • a paints-coated layer coated with heat-resistant paints is formed by applying fluorine paints-based dispersion paints, silicon acryl resin, or acryl fluoride-based resin several time. Also in this step, each layer may be colored differently as described above.
  • each insulating layer is independent and can be separated from other layers means that each layer can be separated from other layers and exists as one independent layer.
  • a means for separating an insulating layer such a method as using a stripper, removing an insulating layer by giving a slit flaw to the insulating layer, removing an insulating layer by burning and cutting the insulating layer with a heated knife, or winding back a wound film, is available.
  • a coating for magnet wire is formed by applying insulating varnishes several times around a conductor and baking the varnishes, and each layer can not be separated from other layers, so that sometimes a magnet wire is not recognized as a multi-layered insulating wire.
  • the bundled insulated conductor according to this invention is manufactured by bundling a plurality of insulated element wires almost in parallel to each other into one conductor having a round cross section or by twisting a plurality of insulated element wires into a conductor having a round section , and generation of an eddy current can be suppressed to a low level because each element conductor of the insulated element wire is insulated respectively, so that increase of high frequency resistance accompanying an eddy current loss can be prevented. Also in bundled insulated conductor, a surface are of conductor is larger than that of a single wire conductor, increase of a loss due to the skin effect can largely be suppressed.
  • a length of twisted conductors can be shortened, and also DC current in a coil can be reduced in proportion to the shortened length of the twist conductors.
  • the multi-layered insulated wire is constructed so that insulation resistance (3.75 kV in case of IEC 950) required by the safety standards is provided and maintained by any 2 insulating layers of the at least 3 insulating layers comprising an insulating layer for the insulated element wire and insulating layers on the bundled insulated conductor, so that the multi-layered insulated wire is accepted as an insulated wire for a winding having appropriate insulation characteristics required by the safety standards, and is free from many of the aforesaid restrictions to conventional types of transformer.
  • FIG. 1 is a drawing showing a cross section of a multi-layered insulated wire for a winding to be used in a transformer according to the invention.
  • FIG. 2 is a drawing showing a cross section of another embodiment of the multi-layered insulated wire for a winding to be used in a transformer according to the invention.
  • FIG 1 is a drawing showing a multi-layered insulated wire according to the invention.
  • a copper wire 31 having a diameter of 0.12 mm was used as an element wire conductor 31, and an insulated element wire was manufactured by arranging a primary insulating layer 33a with a coating thickness of 0. 04 mm formed by means of applying polytetra fluoroethylene (PTFE) dispersion paints around this copper wire 31.
  • PTFE polytetra fluoroethylene
  • a 3-layered insulated wire 34 was manufactured by arranging an extruded layer formed by natural color fluorinated ethylene propylene resin (FEP) (Teflon 100 J, product name of Mitsui Dupont Fluoro-Chemical Corp.) with a thickness of about 0.06 mm around this bundled insulated wire 32 as a secondary insulating 23b, and furthermore by arranging an extruded layer formed by extruding blue FEP with a thickness of about 0.06 mm around this secondary insulating layer 23b as a tertiary 23c.
  • FEP natural color fluorinated ethylene propylene resin
  • FIG. 2 is a drawing showing a cross section of a multi-layered insulated wire which is a modified one according to the this invention.
  • a copper wire having a conductor diameter of 0.12 mm was used as an element wire conductor 31, and an insulating element wire was manufactured by arranging a primary insulating layer 43a by means of extruding natural color FEP with a thickness of 0.04 mm. Then, 19 lines of this element insulated wire were bundled almost in parallel to each other into a bundled insulated conductor 32 having a round cross section and also having an outer diameter of 1.00 mm. Then, a 3-layered insulated wire 44 was manufactured by arranging a secondary insulating layer 43b by means of winding a white PPS film (3.5 mm width ⁇ 0.
  • a switching transformer in which a 3-layered insulated wire according to the embodiment 1 of this invention was used as a secondary winding and a switching transformer in which 0.038 mm polyurethane coated copper wire with a diameter of 0,60 mm was used as a secondary winding were manufactured, using the completely same parts and components in other sections.
  • a switching transformer with an oscillation frequency of 50 kHz using in a switching power source with an output of 136 W these switching transformers were run under the conditions of output voltage of 161 V and output current of 0.5 A, and surface temperature of the winding in each transformer was measured using a thermistor thermometer. The results are shown in Table 2.
  • a bundled insulated conductor manufactured by bundling a plurality of insulated conductors almost in parallel to each other into a conductor having a round cross section, or by twisting a plurality of the aforesaid insulated element wires into a conductor having a round cross section is used, so that heat emission due to an eddy current loss or the skin effect in the conductor can largely be suppressed, and because of this effect it is possible to suppress heat emission from a switching transformer even when the switching frequency is high, which contributes to improvement of efficiency of a switching power source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulated Conductors (AREA)
  • Insulating Of Coils (AREA)

Claims (4)

  1. Fil isolé à couches multiples (34,44) pour un enroulement à utiliser dans un transformateur haute fréquence comprenant :
    (i) au moins deux premières couches isolantes (23b, 23c ; 43b, 43c) autour d'un conducteur, qui est un conducteur en faisceau fabriqué en liant un certain nombre de conducteurs (31) ;
    (ii) chacune desdites au moins deux premières couches isolantes (23b, 23c ; 43b, 43c) comprenant :
    a) une couche enroulée formée en enroulant un film plastique résistant à la chaleur ; ou
    b) une couche extrudée formée en extrudant un matériau résistant à la chaleur ; ou
    c) une couche revêtue formée en appliquant des peintures résistant à la chaleur ;
       et caractérisé en ce que :
    (i) chacune de ladite pluralité de conducteurs (31) a une seconde couche isolante (33a ; 43a) comprenant :
    a) une couche enroulée formée en enroulant un film plastique résistant à la chaleur ; ou
    b) une couche extrudée formée en extrudant un matériau résistant à la chaleur ; ou
    c) une couche revêtue formée en appliquant des peintures résistant à la chaleur ;
    (ii) n'importe laquelle de deux desdites au moins deux premières couches isolantes (23b, 24c ; 43b, 43c) et de ladite seconde couche isolante (33a ; 43a) réalise une résistance isolante de 3,75 kV pendant une minute ; et
    (iv) chacune desdites au moins deux premières couches isolantes et de ladite seconde couche isolante est mutuellement indépendante et séparable des autres couches isolantes.
  2. Fil électrique isolé à couches multiples selon la revendication 1, dans lequel le conducteur en faisceaux précité est fabriqué en liant la pluralité précitée de conducteurs (31) presque en parallèle les uns aux autres en un conducteur ayant une section ronde.
  3. Fil électrique isolé à couches multiples selon la revendication 1, dans lequel le conducteur en faisceau est fabriqué en torsadant et reliant la pluralité précitée des conducteurs (31) en un conducteur ayant une section ronde.
  4. Fil électrique isolé à couches multiples selon la revendication 1, la revendication 2 ou la revendication 3 dans lequel la pluralité de conducteurs (31) sont des fils de cuivre.
EP95113100A 1992-08-19 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence Expired - Lifetime EP0684617B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1992627599 DE69227599T2 (de) 1992-08-19 1992-08-19 Mehrlagig isolierter Draht für Hochfrequenz Transformatorwindung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92307575A EP0583521B2 (fr) 1992-08-12 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP92307575.8 Division 1992-08-19
EP92307575A Division EP0583521B2 (fr) 1992-08-12 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence

Publications (3)

Publication Number Publication Date
EP0684617A2 EP0684617A2 (fr) 1995-11-29
EP0684617A3 EP0684617A3 (fr) 1996-09-25
EP0684617B1 true EP0684617B1 (fr) 1998-11-11

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP95113100A Expired - Lifetime EP0684617B1 (fr) 1992-08-19 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence
EP95108611A Expired - Lifetime EP0673044B1 (fr) 1992-08-19 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP95108611A Expired - Lifetime EP0673044B1 (fr) 1992-08-19 1992-08-19 Fil isolé à couches multiples pour enroulement de transformateur à haute fréquence

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EP (2) EP0684617B1 (fr)
DE (1) DE69210398T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL136301A (en) 2000-05-22 2005-09-25 Payton Planar Magnetics Ltd Method of insulating a planar transformer printed circuit and lead frame windings forms

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6903660A (fr) * 1968-03-26 1969-09-30
JPS6358709A (ja) * 1986-08-28 1988-03-14 カ−リスル　コ−ポレ−シヨン 多層耐高温絶縁体で絶縁された導体
JPH0249801U (fr) 1988-09-29 1990-04-06
JPH0249802U (fr) 1988-10-04 1990-04-06
JP2557965B2 (ja) 1988-12-01 1996-11-27 日本電信電話株式会社 画像の符号化方式
JPH0325219U (fr) * 1989-03-01 1991-03-15
JP2593101B2 (ja) * 1990-06-08 1997-03-26 サンケン電気株式会社 コイル装置

Also Published As

Publication number Publication date
EP0684617A2 (fr) 1995-11-29
EP0673044A3 (fr) 1995-10-18
DE69210398D1 (de) 1996-06-05
DE69210398T3 (de) 2003-06-05
EP0673044B1 (fr) 1997-01-22
EP0673044A2 (fr) 1995-09-20
EP0684617A3 (fr) 1996-09-25
DE69210398T2 (de) 1996-10-24

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